RX95HF datasheet(17/44 Pages) STMICROELECTRONICS

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RX95HF

Commands

5.5

Pollfield command (0x03) description

This command returns the current value of the FieldDet flag.

5.6

Listen command (0x05) description

In Tag Emulation mode, this command waits for a command from an external reader.

Before sending this command, the application must select a protocol.

Table 10. POLLFIELD command description

Direction

Data

Comments

Example

Host to

RX95HF

Command code

>>>0x0300 Check if RF Field

is ON or OFF

>>> 0x0303010FFF

- Wait for RF

Field appearance for (16*256)/13.56 μs

Flags

, Presc and Timer parameters

are optional. They must be specidfied if

the application has to wait for RF field

appearance or disappearance.

The time to wait is

(Presc+1)*(Timer+1)/13.56 μs.

<Len>

Length of data

<Flags>

RF field presence

(Optional):

: Wait for RF field

appearance

: Wait for RF field

disappearance

<Presc>

Timer prescaler (Optional)

<Timer>

Timer time-out (Optional)

RX95HF to

Host

Result code

<<<0x0000 or 0x000100

(No RF

field detected) or 0x000101 (RF field

detected)

Length of data

, if FieldDet is set.

Otherwise, 00.

Table 11. Response for <POLLFIELD> command

Function

Explanation

Response example

Comments

Pollfield

Response

01 or 00

This command returns the

current state of the RF

field.

<<<0x0000 or

0x000100

(No RF field

detected) or 0x000101

(RF field detected)

Result code

Length of data field

Bits [7:1]: RFU

Bit 0: Field detected (if set)

Table 12. LISTEN command description

Direction

Data

Comments

Example

Host to

RX95HF

Command code

0x0500

: Enters a Listening mode

where the RX95HF waits for a

command from an external reader.

Length of data

RX95HF to

Host

Result code

0x0000

: No error. Confirmation that

RX95HF now is in Listening mode.

Length of data

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